The TripAdvisor “Cities I’ve Visited” Application for Facebook is a pretty interesting widget to share your travel experience with friends on the popular social networking site. It’s free and takes only a moment to set-up. After you’re done, you can notify friends of recommendations, see which friends have traveled to the same places, post yourself as a trip advisor for specific destinations, note that you will be traveling to a certain area and request recommendations from friends and strangers that have traveled there previously.